Dynamic loading of the .DLLs - hitting a snag

OpenGL Development JOGL Development
#21

How’s about just a static call, passing in the path to your lib directory?

#22

Bugger. Like I expected then.

I don’t know if that solution would be any better than just shipping the natives unpacked and I guess that java doesn’t allow you to mount a virtual filesystem in RAM memory either ?

// Tomas

// Tomas

#23

It would still enable them to make a function to load the libs dynamically for the right os without the user needing to use -Djava.library.path.

Incidentally, does anyone know of a way to do the noddraw workaround in code?

#24

True.

#25

I suggested some extracting/loading procedure to someone a while ago http://192.18.37.44/forums/index.php?topic=10074.msg79958#msg79958
Still haven’t tried it though. Maybe if you combine it with File#deleteOnExit to avoid littering the disk with libraries it might work :slight_smile:

#26

Ken, we’re still having trouble, with the code posted above, getting jawt loaded on OS X. Any more suggestions from your bag of tricks?

#27

Could you please post the exception stack trace?

#28

Sure, as soon as my tester with the Mac gets online :slight_smile:

#29

Hello,
Thank you very much for the useful info you provide.
I tried the dynamic loading of the native libraries, and it works fine under windows and linux.

I had a problem on mac, but finally I managed to figure it out.
So it works now on mac as well!
The difference from Jaeden’s code is, that I do not load jawt on mac.
I had a lot of trouble from mismatching versions of jar and native files.
Hope this helps.

#30

Hi,
i’m trying to do the same things by loading the DLLs and the jar file from my code but i’m not able.

Here is the code i use (same as Jaeden):


        //Allow loader
        NativeLibLoader.disableLoading();

        //Seems to have to load awt first
        java.awt.Toolkit.getDefaultToolkit();
        System.loadLibrary("jawt"); 
        
        //Load the jogl jar file
        URL urlJOGL = (new File(ThinClient.getPath() + "jogl.jar")).toURL();
        URL[] urls = { urlJOGL };            
        URLClassLoader classLoader = new URLClassLoader(urls);

        //Load the DLLs
        System.load(ThinClient.getPath() + "jogl.dll");
        System.load(ThinClient.getPath() + "jogl_awt.dll");

After this, i’m getting this error


java.lang.NoClassDefFoundError: com/sun/opengl/impl/NativeLibLoader
...

It was like if my jar wasn’t loaded. Anybody have an idea?

I want to do this cause on Windows i’m able to put the jar into the lib/ext folder and the DLLs into the bin folder of the JRE the first time, but i need a cross platform solution. On Linux i can’t do this, cause the JRE folders are 99% with root acces, so i cannont use this method with normal user. This solution seems good cause i put the files into the home directory of the user (i’ll adapt the code for others os after i’ll be able to load the stufss dynamically).

thx a lot!!!

#31

I finaly use Java WebStart and that working very well

thx a lot
i’m leaving this topic